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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Warn about incomplete implementation of declared properties already declared in base class"
href="http://llvm.org/bugs/show_bug.cgi?id=16161">16161</a>
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<th>Summary</th>
<td>Warn about incomplete implementation of declared properties already declared in base class
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.1
</td>
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<th>Hardware</th>
<td>Macintosh
</td>
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<th>OS</th>
<td>MacOS X
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>negm-awad@cocoading.de
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>A. Steps to reproduce
1. Define a base class with a read-only property
@interface BaseClass : NSObject
@property (readonly) id property;
@end
2. Define a protocol that contains a read-write property with the same name
@protocol Protocol
@property (readwrite) id property;
@end
3. Derive from BaseClass importing the protocol
@interface DerivedClass : BaseClass <Protocol>
@end
4. Autosynthesize that property (I know, that's illegal, look below)
@implementation DerivedClass
@end
B. Existing behaviour
Step 4 is illegal. Without the readonly property in the base class, I will get
a warning:
Auto property synthesis will not synthesize property declared in a protocol.
(Documented behavior)
With the readonly property in the base class, I neither get a warning about
auto synthesize nor about incomplete implementation.
C. Expected behavior
One of the warnings above.
Thank you!</pre>
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